Phones don’t die imediately because of water damage, they die in a day or two because of corrosion damage and the water actually getting to the important components. Either way, quite an impresive performance.﻿

That test doesn’t account for movement though. While it’s MASSIVELY impressive they lasted more than an hour, if someone were to say, swim with it, the water movement would cause increased ingress into the device(s). 1 hour though, very impressed!﻿